Drones are becoming an increasingly common sight in our skies. Today, they're piloted by a range of users, from amateur enthusiasts and the military to pizza delivery companies.

Drones are being utilized in the energy sector too. Sky Futures, for example, uses drones to carry out inspections on energy infrastructure.

"We work with large engineering firms that may work in renewables or oil and gas," James Harrison, its co-founder and CEO, told CNBC in an interview. "We enable them to fly drones to collect visual static and thermal data of those assets."

These businesses can then use software to extrapolate information from that data so that anomalies, cracks and defects can be identified. This, Harrison said, allowed customers to predict maintenance schedules so "they can be more efficient and run them better in the future."